双层网络中上行链路干扰的建模与分析

Modelling and Analysis of uplink Interference in a Two-layer Network

在传统宏基站无缝覆盖的基础上引入新的低功率节点构成双层网络,可以实现高速数据传输.双层网络的宏基站和低功率节点复用相同频谱实现高速数据服务的同时,也会产生严重的干扰,成为制约网络性能提升的关键问题.针对双层网络的上行链路干扰进行了建模与分析.采用泊松点过程建模无线环境中干扰节点的随机分布,考虑了路径损耗和阴影衰落的影响,并通过中断概率表征和分析了干扰对宏用户性能的影响.通过仿真分析了传播特性、微用户密度、微用户发射功率与中断概率的关系.

Low power nodes （LPNs） can be deployed within the seamless coverage of the con- ventional macro base stations （MBSs） ,thus high date rate services can be provided by the heteroge- neous networking of this two types of nodes. However, the frequency reuse of the MBSs and the LPNs result in a severe co-channel interference,which becomes the bottleneck in the improvement of the network performance. An uplink interference modelling and analysis in a two-layer network is introduced. The interferers are scattered according to a spatial Poisson process and are operating in a wireless environment subject to path loss as well as arbitrary fading and shadowing effects and the performance of MBSs is characterized by outage probability. The connection is analysed between the distribution of the network interference and various important system parameters, such as the trans- mitted power and the spatial density of the interferers.